зеркало из https://github.com/mozilla/gecko-dev.git
494 строки
11 KiB
C++
494 строки
11 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* Based on original code from nsIStringStream.cpp
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*/
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#include "ipc/IPCMessageUtils.h"
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#include "nsStringStream.h"
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#include "nsStreamUtils.h"
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#include "nsReadableUtils.h"
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#include "nsICloneableInputStream.h"
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#include "nsISeekableStream.h"
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#include "nsISupportsPrimitives.h"
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#include "nsCRT.h"
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#include "prerror.h"
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#include "plstr.h"
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#include "nsIClassInfoImpl.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/ipc/InputStreamUtils.h"
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#include "nsIIPCSerializableInputStream.h"
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using namespace mozilla::ipc;
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using mozilla::Maybe;
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using mozilla::Some;
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//-----------------------------------------------------------------------------
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// nsIStringInputStream implementation
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//-----------------------------------------------------------------------------
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class nsStringInputStream final
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: public nsIStringInputStream
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, public nsISeekableStream
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, public nsISupportsCString
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, public nsIIPCSerializableInputStream
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, public nsICloneableInputStream
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{
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIINPUTSTREAM
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NS_DECL_NSISTRINGINPUTSTREAM
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NS_DECL_NSISEEKABLESTREAM
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NS_DECL_NSISUPPORTSPRIMITIVE
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NS_DECL_NSISUPPORTSCSTRING
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NS_DECL_NSIIPCSERIALIZABLEINPUTSTREAM
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NS_DECL_NSICLONEABLEINPUTSTREAM
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nsStringInputStream()
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: mOffset(0)
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{
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Clear();
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}
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nsresult Init(nsCString&& aString);
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private:
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~nsStringInputStream()
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{
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}
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uint32_t Length() const
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{
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return mData.Length();
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}
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uint32_t LengthRemaining() const
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{
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return Length() - mOffset;
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}
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void Clear()
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{
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mData.SetIsVoid(true);
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}
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bool Closed()
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{
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return mData.IsVoid();
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}
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nsDependentCSubstring mData;
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uint32_t mOffset;
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};
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nsresult
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nsStringInputStream::Init(nsCString&& aString)
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{
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if (!mData.Assign(std::move(aString), fallible)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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mOffset = 0;
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return NS_OK;
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}
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// This class needs to support threadsafe refcounting since people often
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// allocate a string stream, and then read it from a background thread.
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NS_IMPL_ADDREF(nsStringInputStream)
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NS_IMPL_RELEASE(nsStringInputStream)
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NS_IMPL_CLASSINFO(nsStringInputStream, nullptr, nsIClassInfo::THREADSAFE,
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NS_STRINGINPUTSTREAM_CID)
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NS_IMPL_QUERY_INTERFACE_CI(nsStringInputStream,
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nsIStringInputStream,
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nsIInputStream,
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nsISupportsCString,
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nsISeekableStream,
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nsIIPCSerializableInputStream,
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nsICloneableInputStream)
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NS_IMPL_CI_INTERFACE_GETTER(nsStringInputStream,
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nsIStringInputStream,
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nsIInputStream,
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nsISupportsCString,
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nsISeekableStream,
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nsICloneableInputStream)
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/////////
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// nsISupportsCString implementation
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/////////
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NS_IMETHODIMP
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nsStringInputStream::GetType(uint16_t* aType)
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{
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*aType = TYPE_CSTRING;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::GetData(nsACString& data)
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{
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// The stream doesn't have any data when it is closed. We could fake it
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// and return an empty string here, but it seems better to keep this return
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// value consistent with the behavior of the other 'getter' methods.
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if (NS_WARN_IF(Closed())) {
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return NS_BASE_STREAM_CLOSED;
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}
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data.Assign(mData);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::SetData(const nsACString& aData)
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{
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if (NS_WARN_IF(!mData.Assign(aData, fallible))) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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mOffset = 0;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::ToString(char** aResult)
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{
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// NOTE: This method may result in data loss, so we do not implement it.
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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/////////
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// nsIStringInputStream implementation
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/////////
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NS_IMETHODIMP
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nsStringInputStream::SetData(const char* aData, int32_t aDataLen)
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{
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if (NS_WARN_IF(!aData)) {
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return NS_ERROR_INVALID_ARG;
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}
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if (NS_WARN_IF(!mData.Assign(aData, aDataLen, fallible))) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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mOffset = 0;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::AdoptData(char* aData, int32_t aDataLen)
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{
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if (NS_WARN_IF(!aData)) {
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return NS_ERROR_INVALID_ARG;
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}
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mData.Adopt(aData, aDataLen);
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mOffset = 0;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::ShareData(const char* aData, int32_t aDataLen)
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{
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if (NS_WARN_IF(!aData)) {
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return NS_ERROR_INVALID_ARG;
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}
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if (aDataLen < 0) {
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aDataLen = strlen(aData);
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}
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mData.Rebind(aData, aDataLen);
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mOffset = 0;
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return NS_OK;
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}
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NS_IMETHODIMP_(size_t)
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nsStringInputStream::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf)
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{
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size_t n = aMallocSizeOf(this);
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n += mData.SizeOfExcludingThisIfUnshared(aMallocSizeOf);
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return n;
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}
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/////////
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// nsIInputStream implementation
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/////////
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NS_IMETHODIMP
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nsStringInputStream::Close()
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{
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Clear();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::Available(uint64_t* aLength)
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{
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NS_ASSERTION(aLength, "null ptr");
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if (Closed()) {
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return NS_BASE_STREAM_CLOSED;
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}
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*aLength = LengthRemaining();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::Read(char* aBuf, uint32_t aCount, uint32_t* aReadCount)
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{
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NS_ASSERTION(aBuf, "null ptr");
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return ReadSegments(NS_CopySegmentToBuffer, aBuf, aCount, aReadCount);
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}
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NS_IMETHODIMP
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nsStringInputStream::ReadSegments(nsWriteSegmentFun aWriter, void* aClosure,
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uint32_t aCount, uint32_t* aResult)
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{
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NS_ASSERTION(aResult, "null ptr");
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NS_ASSERTION(Length() >= mOffset, "bad stream state");
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if (Closed()) {
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return NS_BASE_STREAM_CLOSED;
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}
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// We may be at end-of-file
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uint32_t maxCount = LengthRemaining();
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if (maxCount == 0) {
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*aResult = 0;
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return NS_OK;
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}
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if (aCount > maxCount) {
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aCount = maxCount;
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}
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nsresult rv = aWriter(this, aClosure, mData.BeginReading() + mOffset, 0,
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aCount, aResult);
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if (NS_SUCCEEDED(rv)) {
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NS_ASSERTION(*aResult <= aCount,
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"writer should not write more than we asked it to write");
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mOffset += *aResult;
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}
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// errors returned from the writer end here!
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::IsNonBlocking(bool* aNonBlocking)
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{
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*aNonBlocking = true;
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return NS_OK;
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}
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/////////
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// nsISeekableStream implementation
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/////////
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NS_IMETHODIMP
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nsStringInputStream::Seek(int32_t aWhence, int64_t aOffset)
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{
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if (Closed()) {
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return NS_BASE_STREAM_CLOSED;
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}
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// Compute new stream position. The given offset may be a negative value.
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int64_t newPos = aOffset;
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switch (aWhence) {
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case NS_SEEK_SET:
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break;
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case NS_SEEK_CUR:
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newPos += mOffset;
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break;
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case NS_SEEK_END:
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newPos += Length();
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break;
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default:
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NS_ERROR("invalid aWhence");
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return NS_ERROR_INVALID_ARG;
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}
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if (NS_WARN_IF(newPos < 0) || NS_WARN_IF(newPos > Length())) {
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return NS_ERROR_INVALID_ARG;
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}
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mOffset = (uint32_t)newPos;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::Tell(int64_t* aOutWhere)
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{
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if (Closed()) {
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return NS_BASE_STREAM_CLOSED;
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}
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*aOutWhere = mOffset;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::SetEOF()
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{
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if (Closed()) {
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return NS_BASE_STREAM_CLOSED;
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}
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mOffset = Length();
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return NS_OK;
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}
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/////////
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// nsIIPCSerializableInputStream implementation
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/////////
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void
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nsStringInputStream::Serialize(InputStreamParams& aParams,
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FileDescriptorArray& /* aFDs */)
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{
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StringInputStreamParams params;
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params.data() = PromiseFlatCString(mData);
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aParams = params;
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}
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bool
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nsStringInputStream::Deserialize(const InputStreamParams& aParams,
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const FileDescriptorArray& /* aFDs */)
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{
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if (aParams.type() != InputStreamParams::TStringInputStreamParams) {
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NS_ERROR("Received unknown parameters from the other process!");
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return false;
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}
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const StringInputStreamParams& params =
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aParams.get_StringInputStreamParams();
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if (NS_FAILED(SetData(params.data()))) {
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NS_WARNING("SetData failed!");
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return false;
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}
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return true;
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}
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Maybe<uint64_t>
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nsStringInputStream::ExpectedSerializedLength()
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{
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return Some(static_cast<uint64_t>(Length()));
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}
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/////////
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// nsICloneableInputStream implementation
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/////////
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NS_IMETHODIMP
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nsStringInputStream::GetCloneable(bool* aCloneableOut)
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{
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*aCloneableOut = true;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::Clone(nsIInputStream** aCloneOut)
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{
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RefPtr<nsStringInputStream> ref = new nsStringInputStream();
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nsresult rv = ref->SetData(mData);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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// mOffset is overwritten by SetData().
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ref->mOffset = mOffset;
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ref.forget(aCloneOut);
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return NS_OK;
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}
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nsresult
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NS_NewByteInputStream(nsIInputStream** aStreamResult,
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const char* aStringToRead, int32_t aLength,
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nsAssignmentType aAssignment)
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{
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MOZ_ASSERT(aStreamResult, "null out ptr");
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RefPtr<nsStringInputStream> stream = new nsStringInputStream();
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nsresult rv;
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switch (aAssignment) {
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case NS_ASSIGNMENT_COPY:
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rv = stream->SetData(aStringToRead, aLength);
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break;
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case NS_ASSIGNMENT_DEPEND:
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rv = stream->ShareData(aStringToRead, aLength);
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break;
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case NS_ASSIGNMENT_ADOPT:
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rv = stream->AdoptData(const_cast<char*>(aStringToRead), aLength);
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break;
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default:
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NS_ERROR("invalid assignment type");
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rv = NS_ERROR_INVALID_ARG;
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}
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if (NS_FAILED(rv)) {
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return rv;
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}
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stream.forget(aStreamResult);
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return NS_OK;
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}
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nsresult
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NS_NewCStringInputStream(nsIInputStream** aStreamResult,
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const nsACString& aStringToRead)
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{
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MOZ_ASSERT(aStreamResult, "null out ptr");
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RefPtr<nsStringInputStream> stream = new nsStringInputStream();
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nsresult rv = stream->SetData(aStringToRead);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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stream.forget(aStreamResult);
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return NS_OK;
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}
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nsresult
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NS_NewCStringInputStream(nsIInputStream** aStreamResult,
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nsCString&& aStringToRead)
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{
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MOZ_ASSERT(aStreamResult, "null out ptr");
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RefPtr<nsStringInputStream> stream = new nsStringInputStream();
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nsresult rv = stream->Init(std::move(aStringToRead));
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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stream.forget(aStreamResult);
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return NS_OK;
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}
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// factory method for constructing a nsStringInputStream object
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nsresult
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nsStringInputStreamConstructor(nsISupports* aOuter, REFNSIID aIID,
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void** aResult)
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{
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*aResult = nullptr;
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if (NS_WARN_IF(aOuter)) {
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return NS_ERROR_NO_AGGREGATION;
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}
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RefPtr<nsStringInputStream> inst = new nsStringInputStream();
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return inst->QueryInterface(aIID, aResult);
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}
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